I am sure a call to the county building department will get you the specifications for a suitable fence, including installation requirement, and inspection requirements (if any). I know they have these for pergolas which is similar to fence construction. One of the items was 'wind loading' which gets into foundations and structure strength. You will also get knowledge of any other requirements when you contact them. Good luck with your project.
IMHO, take pictures for the existing installation in case you need to go back to the original installer for damages.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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